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su·per·hard | \ ˌsü-pər-ˈhärd 
\
\Definition of superhard
: extremely hard One way to achieve such a high pressure … is to squeeze a sample between two superhard surfaces.— William J. Nellis
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Merriam-Webster unabridgedWords at Play
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Time Traveler for superhard
The first known use of superhard was in 1891
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